package com.itjianren.employeemanagementsystem.filter;

import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@Component
@WebFilter(urlPatterns = {"/dashboard", "/employee/*"})
public class LoginFilter implements Filter {

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {

        HttpServletRequest httpRequest = (HttpServletRequest) request;
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        HttpSession session = httpRequest.getSession();

        String requestURI = httpRequest.getRequestURI();

        // 允许访问登录页面和登录接口
        if (requestURI.endsWith("/login") || requestURI.endsWith("/login.jsp")) {
            chain.doFilter(request, response);
            return;
        }

        // 检查用户是否登录
        if (session.getAttribute("user") == null) {
            httpResponse.sendRedirect(httpRequest.getContextPath() + "/login");
        } else {
            chain.doFilter(request, response);
        }
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {}

    @Override
    public void destroy() {}
}